1/4×31572=7893kg
in prima saptamana: 7893+4=7897kg vandute
au ramas: 31572-7897=23675kg
2/5×23675=2×4735=9470kg
in a doua saptamana: 9470+13=9483kg vandute
au ramas: 23675-9483=14192kg care s-au vandut in a treia saptamana
Deci: saptamana 1: 7897kg
saptamana 2: 9483kg
saptamana 3: 14192kg